Pipe: Fixed the NPE caused by new regions + history only logic (apache#16879)

Author: Caideyipi

iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/procedure/impl/pipe/task/AlterPipeProcedureV2.java

@@ -187,6 +187,7 @@ public void executeFromCalculateInfoForTask(final ConfigNodeProcedureEnv env) {
                     && !databaseName.startsWith(SchemaConstant.SYSTEM_DATABASE + ".")
                     && !databaseName.equals(SchemaConstant.AUDIT_DATABASE)
                     && !databaseName.startsWith(SchemaConstant.AUDIT_DATABASE + ".")
+                    && !Objects.isNull(currentPipeTaskMeta)
                     && !(PipeTaskAgent.isHistoryOnlyPipe(
                             currentPipeStaticMeta.getSourceParameters())
                         && PipeTaskAgent.isHistoryOnlyPipe(